/* CsJni - .NET / Java Bridge
 * 
 * Copyright 2010 Robert E. Burke Licensed under the Apache License, Version 
 * 2.0 (the "License"); you may not use this file except in compliance with 
 * the License. You may obtain a copy of the License at 
 * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable 
 * law or agreed to in writing, software distributed under the License is 
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
 * KIND, either express or implied. See the License for the specific language 
 * governing permissions and limitations under the License. 
*/

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace CsJni
{
    internal sealed class DelegatePin : IDisposable
    {
        private string mName;
        private Delegate mDelegate;
        private GCHandle mGCHandle;

        public DelegatePin(Delegate theDelegate, string name)
        {
            mName = name;
            mDelegate = theDelegate;
            mGCHandle = GCHandle.Alloc(mDelegate, GCHandleType.Normal);
        }

        public string Name
        {
            get { return mName; }
        }

        public IntPtr ToFunctionPointer()
        {
            return Marshal.GetFunctionPointerForDelegate(mDelegate);
        }

        #region IDisposable Members

        void IDisposable.Dispose()
        {
            if (mDelegate != null)
            {
                if (mGCHandle.IsAllocated)
                {
                    mGCHandle.Free();
                }
                mDelegate = null;
            }
        }

        #endregion IDisposable Members
    }
}
